On the Detectability of Earthquakes in and around Southern Kyushu and Northern Nansei Islands, Japan

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  • 九州南部・南西諸島北部域に発生する地震の検知能力について
  • キュウシュウ ナンブ ナンセイ ショトウ ホクブイキ ニ ハッセイ スル ジシン ノ ケンチ ノウリョク ニ ツイテ

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The detectability of the earthquakes in and around Southern Kyushu and Northern Nansei Islands observed by Nansei-Toko Observatory for Earthquakes and Volcanoes, Kagoshima University was investigated for the period from 1995 to 2001 as the basic data of ability of seismic network. It is revealed that the detectability of 7km depth earthquakes in Southern Kyushu is improved remarkably during the last 7 years, for example from M2.0 in 1995 to M0.5 in 2001 at the Northwestern Kagoshima Prefecture. On the other hand, the detectability in Northern Nansei Islands is without large improvement from October, 1996,then the difference of detectability with Southern Kyushu was enlarged. For the earthquakes at the depth of 160km in Southern Kyushu, detectability of M2.0 or less is estimated to be near limitative. Because it did not change much in adding the high-density seismic stations in October, 2000.

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